The original company went under, they no longer exist, so they obviously don't care.
The software user does not care either. OK, someone made a proprietary fork, and that "someone" is a hyperscaler... so what? The last released version is still out there and still can be used-as is / maintained by you / maintained by other 3rd party.
The new maintainers / fork authors should not care too. They base off the last released version, and their fork is not affected in any shape by what some hyperscalers do.
(I guess you can make an argument that proprietary fork might pull users/resources from the open-source one... but I don't think it's a big issue. If the users chose open-source version to begin with, why would they switch to proprietary fork?)
The original company went under, they no longer exist, so they obviously don't care.
The software user does not care either. OK, someone made a proprietary fork, and that "someone" is a hyperscaler... so what? The last released version is still out there and still can be used-as is / maintained by you / maintained by other 3rd party.
The new maintainers / fork authors should not care too. They base off the last released version, and their fork is not affected in any shape by what some hyperscalers do.
(I guess you can make an argument that proprietary fork might pull users/resources from the open-source one... but I don't think it's a big issue. If the users chose open-source version to begin with, why would they switch to proprietary fork?)